The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2015
Filed:
Sep. 23, 2011
Weiqiang Zhang, Shanghai, CN;
Qi Zhang, Shanghai, CN;
Yan Zhong, Shanghai, CN;
Ching-ho Chou, Taoyuan Hsien, TW;
Jianping Ying, Shanghai, CN;
Weiqiang Zhang, Shanghai, CN;
Qi Zhang, Shanghai, CN;
Yan Zhong, Shanghai, CN;
Ching-Ho Chou, Taoyuan Hsien, TW;
Jianping Ying, Shanghai, CN;
Delta Electronics (Shanghai) Co., Ltd., Shanghai, CN;
Delta Electronics, Inc., Taoyuan Hsien, TW;
Abstract
Provided is a lamp ballast having a filament heating apparatus for gas discharge lamp, including a PFC converter for receiving an AC input voltage and converting the AC input voltage into a DC bus voltage; an inverter connected to an output end of the PFC converter for converting the DC bus voltage into an AC output voltage for driving gas discharge lamps; and a filament heating apparatus connected to the output end of the PFC converter. The filament heating apparatus includes an auxiliary heating circuit for converting the DC bus voltage into a heating power for pre-heating the filaments of the gas discharge lamps; and a control circuit connected to the inverter and the auxiliary heating circuit for generating an auxiliary voltage according to the heating power to activate the PFC converter. After the auxiliary heating circuit has been operating for a predetermined period of time, the auxiliary heating circuit is turned off first and then the inverter is turned on; or otherwise the inverter is turned on first and then the auxiliary heating circuit is turned off.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile